Nesbet, R.K <br/><br/>
Variational principles & methods in theoretical physics & chemistry 
R.K. Nesbet 
 - Cambridge  Cambridge University Press  2003 
 - xiv  229 
<br/><br/><label>ISBN: </label>9780521803915 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Calculus of Variations